Perhaps you should try some spelling variations:
communication concepts » communication circuits, communication congresses, communication channels
2 dimensional » _ dimensional, 3 dimensional, two dimensional
shared space » shared spaces, sacred space, shared care
tuple spaces » tuple space, triple space
type spaces » state spaces
concepts 2 » concepts _, concepts a

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: communication concepts 2 dimensional ((shared space) or (((tuple spaces) or (type spaces))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication concepts 2 dimensional ((shared space) OR (((tuple spaces) OR (type spaces)))).
• Adding a wildcard symbol may retrieve word variants: communication concepts 2 dimensional ((shared space) or (((tuple spaces) or (type spaces))))*.